resolve: Introduce resolve module

The module is responsible for the configuration of the address
resolution services. It will consist of the multiple service
specific plugins such as: systemd-resolved plugin, dnsmasq
plugin, etc.

Makefile.am

@@ -207,6 +207,7 @@ src_iwd_SOURCES = src/main.c linux/nl80211.h src/iwd.h src/missing.h \
 					src/auth-proto.h \
 					src/anqp.h src/anqp.c \
 					src/netconfig.h src/netconfig.c\
+					src/resolve.h src/resolve.c\
 					src/hotspot.h src/hotspot.c \
 					$(eap_sources) \
 					$(builtin_sources)

src/netconfig.c

@@ -38,6 +38,7 @@
 #include "src/common.h"
 #include "src/network.h"
 #include "src/rtnlutil.h"
+#include "src/resolve.h"
 #include "src/netconfig.h"
 
 struct netconfig {
@@ -277,7 +278,9 @@ static bool netconfig_install_addresses(struct netconfig *netconfig,
 	}
 
 gateway:
-	/* TODO: Add the routes and domain name servers. */
+	/* TODO: Add the routes. */
+
+	resolve_add_dns(netconfig->ifindex, ifaddr->family, dns);
 
 	return true;
 }
@@ -299,7 +302,9 @@ static bool netconfig_uninstall_addresses(struct netconfig *netconfig,
 	}
 
 gateway:
-	/* TODO: Remove the routes and domain name servers. */
+	/* TODO: Remove the routes. */
+
+	resolve_remove(netconfig->ifindex);
 
 	return true;
 }

src/resolve.c

@@ -0,0 +1,58 @@
+/*
+ *
+ *  Wireless daemon for Linux
+ *
+ *  Copyright (C) 2019  Intel Corporation. All rights reserved.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <errno.h>
+
+#include <ell/ell.h>
+
+#include "src/iwd.h"
+#include "src/resolve.h"
+
+void resolve_add_dns(uint32_t ifindex, uint8_t type, char **dns_list)
+{
+}
+
+void resolve_remove(uint32_t ifindex)
+{
+}
+
+static int resolve_init(void)
+{
+	bool enabled;
+
+	if (!l_settings_get_bool(iwd_get_config(), "General",
+					"enable_network_config", &enabled) ||
+								!enabled)
+		return 0;
+
+	return 0;
+}
+
+static void resolve_exit(void)
+{
+}
+
+IWD_MODULE(resolve, resolve_init, resolve_exit)

src/resolve.h

@@ -0,0 +1,24 @@
+/*
+ *
+ *  Wireless daemon for Linux
+ *
+ *  Copyright (C) 2019  Intel Corporation. All rights reserved.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+void resolve_add_dns(uint32_t ifindex, uint8_t type, char **dns_list);
+void resolve_remove(uint32_t ifindex);